Heating unit



Dec. 14, 1948. E

HEATING UNIT Filed NOV. 26, 1945 Fig 1 INVENTOR. BY

ATTORNEY Patented Dec. 14, 1948 UNITE!) STATES PATENT- OFFICE" HEATINGom Hoard Lee, Houston, Tex

Application November 26, 1945, Serial No. 630,784

This invention relates to a heating unit.

An object of the invention is to provide a heatin; unit of suchconstruction that the heat will be retained within the unit with minimumloss of heat.

Another object of the invention is to provide a heating unit which hasbeen specially designed for the efficient use of electricity as a sourceof heat and is particularly useful for cooking purposes.

The unit may be designed for slow heating, as is desirable in certainkinds of cooking, or it may be enclosed on top and around the sides withquick heating material for quick heating when that is desired. The unitmay also be enclosed on the bottom and sides by a casing of heatresisting material either with, or Without, insulating material betweenthe casing and the heating unit proper.

Another object of the invention is to provide a heating unit of thecharacter described in which the resistance coil, or heating element, ismounted in a novel manner.

With the above and other objects in view the invention has particularrelation to certain novel features of construction, arrangement of partsand use, an example of which is given in this specification andillustrated in the accompanying drawings, wherein:

Figure l is a plan view with the quick heating Jacket removed,

Figure 2 is a plan view with the quick heating jacket installed,

Figur 3 is an enlarged cross-sectional view, and,

Figure 4 is a perspective view of a type of heating element anchorageemployed.

Referring now more particularly to the drawings wherein like numerals ofreference designate the same parts in each of the figures, the numeral Idesignates the body of the heating unit which, as shown, is circular inform, but which may be made of any selected shape. It is formed of metalof poor thermal conductivity and is preferably, although notnecessarily, mounted on an insulating pad 2, which may be formed ofasbestos.

The body I is provided in its upper surface with a groove, 3 which ispreferably, though not necessarily, spiral and which extendsapproximately throughout the area thereof, and which, in its preferredform, has a vertical outer side and an undercut or dove tailed innersideas more clearly shown in Figure 3. This groove is provided to contain aresistance, or heating, element 4, which is 1 Claim. (Cl. 219-37) 2shown in Figure 1 as being formed of a suitable electrical conductorcoil.

This resistance element is supported in place by anchors 5 preferablyformed of porcelain and having the same shape as the cross-sectionalcontour of the groove 3, so as to fit therein.

It will be noted that one end of the groove extends to the margin of thebody I, as shown in Figure 1, and before installing the jacket, orcasing, as hereinafter referred to the required number of anchors 5 maybe slipped over the resistance coil 4 and said coil may then be insertedendwise into the groove 3 and the anchors suscessively fitted into andmoved along, the groove until the resistance element 4 is completelyinstalled in place and the anchors may then be adjusted the requireddistance apart, as shown in Figure 1 so as to support theresistanceelement in place. The ends of said element may'then be securedin place by terminals 6, 6 which form connections for electricalconductors.

If desired the resistance element may be surrounded through the lengthof the, groove 3, by suitable insulating material as 8, as indicated inFigure 1, which is flush with the upper surface of the body I. The heatfrom the resistance element 4 will thereby be quickly carried to thecooking surface. The heat will also be distributed through the body Iand when said body becomes thoroughly heated the current can be loweredand the heat stored up in the body I. Metal or poor thermal conductivitycan thus be utilized with a minimum loss of heat, resulting in a savingof electrical current.

The body I and insulating pad 2 maybe enclosed by a casing I, as bestshown in Figure 3. This casing is formed of heat resisting metal and iseffective to prevent dissipation, and loss, 01' heat from the body I. l

If desired the body I may be enclosed on top with a cap like jacket 9 ofsuitable metal. This jacket is not indispensable but it is preferable.However for slow heating purposes the jacket may be dispensed with.

This application is a continuation in part of my co-pending applicationfor Heating element filed November 3, 1944, under Serial Number 561,740.

The drawings and description are illustrative merely while the broadprinciple of the invention will be defined by the appended claim.

What I claim is:

A heating unit comprising, a body formed of metal of poor thermalconductivity and having a sinuous groove in the upper face thereof whichextends approximately throughout the area of said face, anchors formedof insulating material spaced apart along said groove, a resistorextending approximately from end to end of the groove and maintained inplace by saidanchors in spaced relation to the walls of the groove, ajacket into which the body is fitted, said jacket in-cIuding acontinuous flanged plate lying adjacent the resistor, a continuousinsulating coating, or covering, on the side of the unit opposite thegrooved side, a casing of heat resisting metal enclosing the margins ofthe body and enclosing theside of the body, opposite the groove,throughout its entire area and in contact with said insulating coatingor covering throughout the area. thereof, the free with the flange ofthe plate.

HOARD LEE- REFERENCES CITED The following references are of record inthe file of this patent:

UNITED STATES PATENTS Number Name Date 1,322,670 Dagenais Nov. 25, 19191,436,034 Hamlin Nov. 21, 1922 1,644,255 Kercher et-al Octmi, 19272,026,797 Pierson Jan. 7, 1936 FOREIGN PATENTS Number Country Date650,590 France Sept, 24, 1928

